Robert Nurse
Carrageenans are a family of linear sulphated polysaccharides extracted from red seaweeds. The name is derived from a type of seaweed that is abundant along the Irish coastline. Gelatinous extracts of the Chondrus crispus seaweed have been used as food additives for hundreds of years, though analysis of carrageenan safety as an additive continues.

hycargif.gif
hycargif.gif
Carrageenan a alkaline extraction of red seaweed. Different types of Seaweed produce different types of carrageenan
http://www.lsbu.ac.uk/water/hycar.html
http://www.lsbu.ac.uk/water/hycar.html

Desserts, ice cream, milk shakes, sauces — gel to increase viscosity
Beer — clarifier to remove haze-causing proteins
Pâtés and processed meat — Substitute fat to increase water retention and increase volume
Toothpaste — stabilizer to prevent constituents separating
Fire fighting foam — thickener to cause foam to become sticky
Shampoo and cosmetic creams — thickener
Air freshener gels
Marbling -- the ancient art of paper and fabric marbling uses a carrageenan mixuture to float paints or inks upon; the paper or fabric is then laid on it, absorbing the colors.
Shoe polish — gel to increase viscosity
Biotechnology — gel to immobilize cells/enzymes
Pharmaceuticals — used as an inactive excipient in pills/tablets
Carrageenan has also been used to thicken skim milk, in an attempt to emulate the consistency of whole milk. This usage did not become popular. It's used in some brands of soy milk
Diet sodas
Lambda carrageenan is used in animal models of inflammation used to test analgesics, because dilute carrageenan solution (1-2%) injected subcutaneously causes swelling and pain.